University of Cambridge > > Engineering Department Structures Research Seminars > 'Effect of Moisture Uptake on the Shear Stiffness of CFRP Tendons and the Role of the Manufacturing Route'

'Effect of Moisture Uptake on the Shear Stiffness of CFRP Tendons and the Role of the Manufacturing Route'

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The influence of moisture uptake on the shear stiffness of carbon fibre reinforced (CFRP) tendons is important for CFRP prestressed concrete off-shore applications. To evaluate the shear stiffness degradation, torsion tests were conducted (in accordance with the ASTM E143 -02 standard) on cylindrical CFRP tendons subjected to different moisture environments. A torsion test was considered to be advantageous since it facilitates a direct interpretation of the matrix dominated degradation properties. Two different diameter CFRP tendons with similar resin properties were tested.

The smaller diameter tendons were smooth whereas the larger diameter tendons were originally sand coated but the coating was manually scraped off. The 300 mm long CFRP tendon sections were dried in an oven at 60°C and were then immersed in distilled water at 20°C. To avoid a premature failure in the clamping areas, only the central 200 mm length was exposed. The shear stiffness of the tendons was regularly measured by conducting torsion tests over exposure time. It was found that the measured torsional shear stiffness decreased with exposure time for both groups of CFRP tendons. The degree of degradation was higher for the smaller diameter tendons. The difference in the degradation and moisture uptake rate between the two groups of CFRP tendons are attributed to the different manufacturing routes. The degree of curing and the void growth during the pultrusion manufacturing process are being investigated.

This talk is part of the Engineering Department Structures Research Seminars series.

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